linux-kernel - Re: [PATCH] regmap: irq: Allow using zero value for ack

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Date:	Sun, 15 Dec 2013 13:51:38 +0400
From:	Alexander Shiyan <shc_work@...l.ru>
To:	Levente Kurusa <levex@...ux.com>
Cc:	linux-kernel@...r.kernel.org,
	Mark Brown <broonie@...nel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: [PATCH] regmap: irq: Allow using zero value for ack_base

> On 12/15/2013 10:36 AM, Alexander Shiyan wrote:
> > In some cases, clear interrupt register may be at address 0.
> > This patch allows to use such configurations by adding additional
> > configuration bit to indicate this.
> > 
> > Signed-off-by: Alexander Shiyan <shc_work@...l.ru>
> > ---
> >  drivers/base/regmap/regmap-irq.c | 6 +++---
> >  include/linux/regmap.h           | 5 ++++-
> >  2 files changed, 7 insertions(+), 4 deletions(-)
...
> > diff --git a/include/linux/regmap.h b/include/linux/regmap.h
> > index e559078..3a36f61 100644
> > --- a/include/linux/regmap.h
> > +++ b/include/linux/regmap.h
...
> > @@ -520,6 +522,7 @@ struct regmap_irq_chip {
> >  	unsigned int irq_reg_stride;
> >  	bool init_ack_masked:1;
> >  	bool mask_invert:1;
> > +	bool use_ack:1;
> I think this will break something. Better use 0 as default value.
> Reason I think so, is because in the above code you effectively add a new
> possibility for most code to run.

This is not a default value but bit-size of this field.

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